RESTEASY003145: Unable to find a MessageBodyReader of content-type application/json and type class org.keycloak.representations.AccessTokenResponse

Question

I\'m trying to test Keycloak REST API. Instaled the version 2.1.0.Final. I can access the admin through browser with SSL without problems.

I\'m using the code above:

Answer 1

On a wildfly 11 / Keycloak context, the following made it work with the RestEasyClientBuilder.

ResteasyClientBuilder builder = new ResteasyClientBuilder();
ResteasyProviderFactory providerFactory = ResteasyProviderFactory.getInstance();
builder.providerFactory(providerFactory);

Double check if ResteasyProviderFactory defaults to true with your Resteasy version. If not, set the builtIns manually:

ResteasyProviderFactory.setRegisterBuiltinByDefault(true);
// or if ResteasyProviderFactory was already instantiated
RegisterBuiltin.register(providerFactory);